What does nonvascular mean?
Nonvascular describes organisms or tissues that lack specialized vascular structures. Its best-known use is botanical: mosses, liverworts, and hornworts are nonvascular plants because they do not possess the xylem and phloem tissue found in vascular plants. Xylem transports water and minerals, while phloem distributes sugars and other organic nutrients. Without these conducting systems, nonvascular plants generally remain small and rely on diffusion and direct absorption to move water and nutrients over short distances. The word is also used more broadly in biology for tissue or organisms that lack blood vessels, although this is less frequent than the botanical sense. Nonvascular is usually neutral and technical rather than evaluative. It is especially useful in comparisons that distinguish the simple internal organization of bryophytes from the vessel-bearing tissues of trees, ferns, and flowering plants.
adjectiveLacking vascular tissue, especially the specialized tissues that transport water and nutrients in plants. The term is used chiefly of plants and plant-like organisms, including mosses, liverworts, and hornworts.
- Of plants or plant-like organisms: lacking xylem and phloem or other specialized vascular tissues.
- Of biological tissue or an organism more generally: lacking blood vessels or another system of vessels.
"Mosses are nonvascular plants that absorb water directly across their surfaces."
"The forest floor was covered with nonvascular mosses and liverworts."
"The biologist examined the translucent, nonvascular tissue under the microscope."
Mosses conquered the land without pipes: their nonvascular bodies rely on short-range diffusion rather than specialized tissues to move water and nutrients.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does nonvascular come from?
The word is formed in English by combining the prefix non- with vascular. Vascular ultimately comes through French from Latin vascularis, a derivative of vas, meaning “vessel.” The same Latin foundation appears in English words such as vascular, vascularity, vasculum, and vas.
How nonvascular is actually used
This is primarily a scientific term. In botany it normally contrasts with vascular plants; the sense involving blood vessels occurs in zoology and histology but is much less common.
Easily confused with nonvascular
A nonvascular organism or tissue lacks specialized conducting or blood vessels, whereas a vascular one has such vessels.